Finishing-machine.



E. HOPE.

FINISHING MACHINE.

APPLICATION FILED AUG. 7.191].

1,227,622; Patented May 29; 1917.

Li $155! l A '1' MTA SSfi 4 W n/ma 'M c, 417A QM UNITED STATES PATENT OFFICE,

ERNEST HOPE, OF LEICESTER, ENGLAND, ASSIGNOR T SHOE MLAOEINEBY COMPANY, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

FINISHING-MACHINE.

Specification of Letters Patent.

Patented May 29, 191 7.

Application filed August 7, 1911. Serial no. 842,763.

Machines, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the sevc'iral figures.

This invention relates to finishing, bufling, abrading or similar machines and is particularly-applicable to that elm of buifing machines known as the Naumkeag type.- In

machines of this type an u right rotary spindle carries at its lower on a sup ort on which an abrasive cover is stretchedin suitable condition for use upon the tread faces of bootsand shoes to effect an abrading or buflingo ration. t

The 6 ject' of this invention is to provide an improved support for the abrasive or other cover which, while being more resilient and durable than the sup orts hitherto employed for this purpose, all also be cheap to manufacture.

To'this end a feature of-the invention consists in the provision of a pad, which may be formed of rubber or similar material, that.

is provided with internal projections ada ted to bear upon the body part of the spin le holder to resiliently support the abrasive or other cover against the pressure of the work.

"The projections preferably are formed as ribs and they may conveniently be arranged to intersect each other to form inclosed air it is to be understood that the invention is not confined either to the precise construction set forth or 'to the exact arrangement described, since both the construction and arrangement may beyaried, while the spirit of the invention still is maintained.

In the draw Fi re 1 is of a ufling device comprising a holder and an elevation partly in section a pad embodying this invention secured in position on the holder; and v Fig. 2 is ,a I an of part of the pad.

In the bu g device shown, the holder comprises a circular disk-shaped head or support 2 secured to or formed upon the lowerend of a screw threaded stem .4. The

stem is secured to a spindle which is rotated by mechanism of any suitable character. The pad 6 also is circular in form and is somewhat larger in diameter than head 2. The working part or facing '8 of the pad is molded to a convex shape thus presenting a smooth outer surface forthe support of the work member. Upon the inner surface'of the facing aplurality of ribs 10 project which, in the arrangement shown, are constructed to cross or intersect each other at substantially right anglesso as to form a series of regular polygonal pockets or cells 12. Thelower surface of the head 2 referably is plane and the inner edges of t e ribs '10 are arranged to lie in substantially a compneumatically supported by the air which is imprisoned between the walls of ribs and the surfaces of the head 2 and. facing 8.

It will be obvious that the ribs need not cross each other at right angles nor need they be equally spaced apart, as in the con struction shown, although this arrangement aflords a very'convenient and satisfactory construction. The pad preferably is molded of india rubber, the ribs, facin and an inturned rim or flange 14, whic is molded about the margin or periphery of the pad, all being .integral. The flange 14 projects inwardly toward the axis of the pad and is provided for the purpose of securing the pad in operative position in the holder. This flange is first sprung over the head 2, the abrasive or other cover is stretched over the pad, as indicated at 16 in Fig. 1, and a cover plate 18, which is slidably mounted on the'stem 4, is then brought down upon the flange and the rim of the cover.' A nut 20 that is threaded on to the stem above the cover plate 18 is screwed down against the v other work member 16 but possesses that degree ofresiliency necemary to the successful operation of machines of this character.

In order to assist the workman in separating the cover plate 18 from the head 2 of the holder when the abrasive cover is to be removed or replaced by a new one, a helical spring 22 is mounted loosely upon the stem 4 of the holder between the cover plate 18 and the disk 2'. -This spring also is of advantage in maintaining the parts of the holder separated during the removal or replacement of the covers.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent of the United States is 1. In a machine of the character described, the-combination with a disk-shaped head having an outer supporting face, of a pad comprising a circular facing of rubber molded to a convex shape, its outer surfaceaffording a continuous support for a work rubbing member of sheet material, said facing being of greater diameter than said head and having integral ribs projecting from its inner surface with their edges bearing against the supporting face 0 said head, said ribs being formed to intersect each other to provide air pockets'extending continuously from the inner surface .of' said facing to said supporting face, a marginal flange formed about the periphery of said facing and extending inwardly over the ed e of said head, and means for clamping sa1d flange against said head.

2. A pad of the character described, comprising a circular facing of rubber'aifordmg a continuous support for a work rubbing member of sheet material, said facing ribs integral therewith, said ribs being constructed to form in conjunction with said head air pockets extending from the inner surface of said facing to the under surface of said head, an abrasive cover stretched over said pad, and means for clamping said pad and cover to said' head.

4. A pad for supporting an abrasive cover comprising a facing of rubber affording a continuous support for a work rubbing member of sheet material, said facing having integral ribs projecting from its inner surface, said ribs intersectingeach other to form air pockets extending continuously from the inner surface of said facin inner ed es of the ribs, and a marginal attaching ribs.

In testimony whereof I have signed my name to this ecification in the presence of two subscribing witnesses.

ERNEST HOPE. Witnesses:

JOHN Rrcmnn LAW, 0mm) Bmmrou.

to the ange integral with said facing and. 

